High-excitation water transitions present a promising probe of the dense warm molecular outflowing component but have so far only been observed in one starburst galaxy at z=5.656 [1]}. Alternatively, one can utilize the blue-shifted absorption features of outflowing gas situated between the observer and the host galaxy. The OH 119\(\mu \) m doublet absorption line provides promising strength based on low (e.g., [2]}, [3]}, [4]}, [5]}, [6]}, [7]}), and high redshift investigations [8]} but is only observable with ground-based facilities at redshifts z>4 (e.g., [9]}, [10]}, [11]}).
